The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 01, 1994
Filed:
Jul. 21, 1992
Hiroshi Saka, Katano, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
In a microwave band-pass filter provided with a main line having an input terminal and an output terminal on both ends thereof, first, second, third and fourth open-ended stubs having lengths L1, L2, L3 and L4 connected electrically in parallel to the main line at intervals L0, L0' L0', respectively. The lengths of two of the four open-ended stubs are selected to be substantially equal to a quarter of the wavelength of the first stop-band frequency signal on the band lower than the pass-band, and the lengths of the others thereof are selected to be substantially equal to a quarter of the wavelength of the second stop-band frequency signal on the band higher than the pass-band. In this case, the insertion loss thereof steeply increases on a boundary band from one stop-band to the pass-band. In particular, there can be obtained the microwave band-pass filter having a simpler structure, in which the insertion loss steeply increases on the band higher or lower than the pass-band, and the insertion loss on the band lower or higher than the pass-band is relatively large over a relatively wide band, respectively.